| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a desulfurizing method for improving a desulfurization rate in a desulfurizing process of reducing a sulfur concentration in molten metal including molten iron alloy such as molten steel and stainless steel by a slag-metal reaction using a CaO-SiO<SB POS="POST">2</SB>slag concerning a desulfurizing technology of a refractory sulfur steel. <P>SOLUTION: A slag containing CaO, SiO<SB POS="POST">2</SB>, and Al<SB POS="POST">2</SB>O<SB POS="POST">3</SB>by 80% or more in total and one or more of MgO, Cr<SB POS="POST">2</SB>O<SB POS="POST">3</SB>, MnO, and iron oxide by 20% or less as another component is formed on a surface of the molten metal, and the molten steel and the slag are agitated for a desulfurization treatment. At this time, after concentrations of CaO, SiO<SB POS="POST">2</SB>, and Al<SB POS="POST">2</SB>O<SB POS="POST">3</SB>in the slag are adjusted to simultaneously satisfy Formula (1): (%CaO)/(%Al<SB POS="POST">2</SB>O<SB POS="POST">3</SB>)≥2.3 and Formula (2): 0.4≤(%CaO)/(%SiO<SB POS="POST">2</SB>)≤3.5, and also the molten steel is adjusted to Si concentration [Si]≥0.1 mass% or Al concentration [sol. Al]≥0.005 mass%, BaO is added to the slag to satisfy BaO concentration in the slag as indicated by Formula (3): 4≤(%BaO)≤20. <P>COPYRIGHT: (C)2013,JPO&INPIT |
